The US/CL/1918 design

My US/CL/1918 design is an attempt to modernize the light cruiser with turrets, while otherwise retaining the characteristics that it has acquired so far. the armament is now 8-6in QF, 4-4in AA, 16-0.5in MG (AA), and 12-21in TT. The armour basis is 3in with a maximum speed, without pressing, of 34 knots. The range is now 5,600nm at 15 knots. The design is still dependent on very lightweight machinery. This is the Springsharp report:

US/CL/1918, United States Light Cruiser laid down 1918 (Engine 1941)

Displacement:
 7,891 t light; 8,134 t standard; 8,750 t normal; 9,242 t full load

Dimensions: Length overall / water x beam x draught
 558.89 ft / 555.00 ft x 54.00 ft x 20.00 ft (normal load)
 170.35 m / 169.16 m x 16.46 m  x 6.10 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1918 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      4 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1918 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      16 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1918 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, all raised mounts
 Weight of broadside 993 lbs / 450 kg
 Shells per gun, main battery: 120
 12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 420.00 ft / 128.02 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 116 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 3.00" / 76 mm 2.00" / 51 mm  3.00" / 76 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 3.00" / 76 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 102,606 shp / 76,544 Kw = 34.00 kts
 Range 5,600nm at 15.00 kts
 Bunker at max displacement = 1,108 tons

Complement:
 452 - 588

Cost:
 £1.520 million / $6.081 million

Distribution of weights at normal displacement:
 Armament: 124 tons, 1.4 %
 Armour: 1,608 tons, 18.4 %
    - Belts: 614 tons, 7.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 220 tons, 2.5 %
    - Armour Deck: 746 tons, 8.5 %
    - Conning Tower: 27 tons, 0.3 %
 Machinery: 2,712 tons, 31.0 %
 Hull, fittings & equipment: 3,447 tons, 39.4 %
 Fuel, ammunition & stores: 859 tons, 9.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   9,018 lbs / 4,090 Kg = 83.5 x 6.0 " / 152 mm shells or 1.2 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 2.7 ft / 0.8 m
 Roll period: 13.9 seconds
 Steadiness - As gun platform (Average = 50 %): 54 %
   - Recoil effect (Restricted arc if above 1.00): 0.40
 Seaboat quality  (Average = 1.00): 1.08

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.511
 Length to Beam Ratio: 10.28 : 1
 'Natural speed' for length: 23.56 kts
 Power going to wave formation at top speed: 61 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  27.00 ft / 8.23 m
    - Forecastle (20 %): 23.00 ft / 7.01 m
    - Mid (67 %):  23.00 ft / 7.01 m (15.00 ft / 4.57 m aft of break)
    - Quarterdeck (15 %): 15.00 ft / 4.57 m
    - Stern:  15.00 ft / 4.57 m
    - Average freeboard: 20.68 ft / 6.30 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 111.5 %
  - Above water (accommodation/working, high = better): 127.9 %
 Waterplane Area: 20,169 Square feet or 1,874 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 96 lbs/sq ft or 467 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.94
  - Longitudinal: 1.87
  - Overall: 1.01
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent